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Wang Y, Lyu J, Qian X, Chen B, Sun H, Luo W, Chi F, Li H, Ren D. Involvement of Dmp1 in the Precise Regulation of Hair Bundle Formation in the Developing Cochlea. BIOLOGY 2023; 12:biology12040625. [PMID: 37106825 PMCID: PMC10135853 DOI: 10.3390/biology12040625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 04/02/2023] [Accepted: 04/07/2023] [Indexed: 04/29/2023]
Abstract
Dentin matrix protein 1 (Dmp1) is a highly phosphorylated, extracellular matrix protein that is extensively expressed in bone and teeth but also found in soft tissues, including brain and muscle. However, the functions of Dmp1 in the mice cochlea are unknown. Our study showed that Dmp1 was expressed in auditory hair cells (HCs), with the role of Dmp1 in those cells identified using Dmp1 cKD mice. Immunostaining and scanning electron microscopy of the cochlea at P1 revealed that Dmp1 deficiency in mice resulted in an abnormal stereociliary bundle morphology and the mispositioning of the kinocilium. The following experiments further demonstrated that the cell-intrinsic polarity of HCs was affected without apparent effect on the tissue planer polarity, based on the observation that the asymmetric distribution of Vangl2 was unchanged whereas the Gαi3 expression domain was enlarged and Par6b expression was slightly altered. Then, the possible molecular mechanisms of Dmp1 involvement in inner ear development were explored via RNA-seq analysis. The study suggested that the Fgf23-Klotho endocrine axis may play a novel role in the inner ear and Dmp1 may regulate the kinocilium-stereocilia interaction via Fgf23-Klotho signaling. Together, our results proved the critical role of Dmp1 in the precise regulation of hair bundle morphogenesis in the early development of HCs.
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Affiliation(s)
- Yanmei Wang
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai 200031, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China
| | - Jihan Lyu
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai 200031, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China
| | - Xiaoqing Qian
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai 200031, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China
| | - Binjun Chen
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai 200031, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China
| | - Haojie Sun
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai 200031, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China
| | - Wenwei Luo
- Department of Otolaryngology-Head and Neck Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China
- The Second School of Clinical Medicine, South Medical University, Guangzhou 510080, China
| | - Fanglu Chi
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai 200031, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China
| | - Hongzhe Li
- Research Service, VA Loma Linda Healthcare System, Loma Linda, CA 92350, USA
- Department of Otolaryngology-Head and Neck Surgery, Loma Linda University School of Medicine, Loma Linda, CA 92350, USA
| | - Dongdong Ren
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai 200031, China
- NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China
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Yan L, Zhou G, Shahzad K, Zhang H, Yu X, Wang Y, Yang N, Wang M, Zhang X. Research progress on the utilization technology of broccoli stalk, leaf resources, and the mechanism of action of its bioactive substances. FRONTIERS IN PLANT SCIENCE 2023; 14:1138700. [PMID: 37063225 PMCID: PMC10090291 DOI: 10.3389/fpls.2023.1138700] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 03/13/2023] [Indexed: 06/19/2023]
Abstract
Broccoli is a nutritious vegetable. It is high in protein, minerals, and vitamins. Also, it possesses antioxidant activities and is beneficial to the human body. Due to its active effect, broccoli is widely accepted by people in daily life. However, in terms of current utilization, only its florets are consumed as vegetables, while more than half of its stalks and leaves are not utilized. The stalks and leaves contain not only nutrients but also bioactive substances with physiologically regulating properties. Therefore research into the action and mechanism of its bioactive substances as well as its development and utilization technology will make contributions to the further promotion of its resource development and utilization. As a theoretical foundation for the resource utilization of broccoli stalks and leaves, this report will review the distribution and consumption of broccoli germplasm resources, the mechanism of action of bioactive substances, and innovative methods for their exploitation.
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Affiliation(s)
- Lu Yan
- Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
- State Key Laboratory of Sheep Genetic Improvement and Healthy Production, Xinjiang Academy of Agricultural Reclamation, Shihezi, China
| | - Gang Zhou
- Huaiyin Institute of Agricultural Sciences in Xuhuai Region, Huaian, China
| | - Khuram Shahzad
- Department of Biosciences, COMSATS University Islamabad, Islamabad, Pakistan
| | - Haoran Zhang
- Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Xiang Yu
- Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Yusu Wang
- Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Nan Yang
- Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Mengzhi Wang
- Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
- State Key Laboratory of Sheep Genetic Improvement and Healthy Production, Xinjiang Academy of Agricultural Reclamation, Shihezi, China
| | - Xin Zhang
- State Key Laboratory of Sheep Genetic Improvement and Healthy Production, Xinjiang Academy of Agricultural Reclamation, Shihezi, China
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Li P, Qian T, Sun S. Spatial architecture of the cochlear immune microenvironment in noise-induced and age-related sensorineural hearing loss. Int Immunopharmacol 2023; 114:109488. [PMID: 36470117 DOI: 10.1016/j.intimp.2022.109488] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/16/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022]
Abstract
The cochlea encodes sound stimuli and transmits them to the central nervous system, and damage to sensory cells and synapses in the cochlea leads to hearing loss. The inner ear was previously considered to be an immune privileged organ to protect the auditory organ from reactions with the immune system. However, recent studies have revealed the presence of resident macrophages in the cochlea, especially in the spiral ligament, spiral ganglion, and stria vascularis. The tissue-resident macrophages are responsible for the detection, phagocytosis, and clearance of cellular debris and pathogens from the tissues, and they initiate inflammation and influence tissue repair by producing inflammatory cytokines and chemokines. Insult to the cochlea can activate the cochlear macrophages to initiate immune responses. In this review, we describe the distribution and functions of cochlear macrophages in noise-induced hearing impairment and age-related hearing disabilities. We also focus on potential therapeutic interventions concerning hearing loss by modulating local immune responses.
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Affiliation(s)
- Peifan Li
- ENT Institute and Otorhinolaryngology, Department of Affiliated Eye and ENT Hospital, Key Laboratory of Hearing Medicine of NHFPC, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, 200031, China; Eye and ENT Hospital, Fudan University, Shanghai, 200031, China
| | - Tingting Qian
- ENT Institute and Otorhinolaryngology, Department of Affiliated Eye and ENT Hospital, Key Laboratory of Hearing Medicine of NHFPC, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, 200031, China; Eye and ENT Hospital, Fudan University, Shanghai, 200031, China
| | - Shan Sun
- ENT Institute and Otorhinolaryngology, Department of Affiliated Eye and ENT Hospital, Key Laboratory of Hearing Medicine of NHFPC, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, 200031, China; Eye and ENT Hospital, Fudan University, Shanghai, 200031, China.
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Key Signaling Pathways Regulate the Development and Survival of Auditory Hair Cells. Neural Plast 2021; 2021:5522717. [PMID: 34194486 PMCID: PMC8214483 DOI: 10.1155/2021/5522717] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 05/01/2021] [Accepted: 05/31/2021] [Indexed: 01/16/2023] Open
Abstract
The loss of auditory sensory hair cells (HCs) is the most common cause of sensorineural hearing loss (SNHL). As the main sound transmission structure in the cochlea, it is necessary to maintain the normal shape and survival of HCs. In this review, we described and summarized the signaling pathways that regulate the development and survival of auditory HCs in SNHL. The role of the mitogen-activated protein kinase (MAPK), phosphoinositide-3 kinase/protein kinase B (PI3K/Akt), Notch/Wnt/Atoh1, calcium channels, and oxidative stress/reactive oxygen species (ROS) signaling pathways are the most relevant. The molecular interactions of these signaling pathways play an important role in the survival of HCs, which may provide a theoretical basis and possible therapeutic interventions for the treatment of hearing loss.
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Ihler F, Freytag S, Kloos B, Spiegel JL, Haubner F, Canis M, Weiss BG, Bertlich M. Lipopolysaccharide decreases cochlear blood flow dose dependently in a guinea pig animal model via TNF signaling. Microcirculation 2021; 28:e12681. [PMID: 33501679 DOI: 10.1111/micc.12681] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/15/2021] [Accepted: 01/20/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To evaluate the effect of Lipopolysaccharide (LPS), a bacterial endotoxin on cochlear microcirculation, and its mode of action. METHODS Twenty-five Dunkin-Hartley guinea pigs were divided into five groups of five animals each. After surgical preparation, cochlear microcirculation was quantified by in vivo fluorescence microscopy. Placebo or LPS (1 mg, 10 µg, and 100 ng) was applied topically, and microcirculation was measured before and twice after application. A fifth group was pretreated with etanercept, a tumor necrosis factor (TNF) antagonist, and afterward the lowest LPS concentrations that yielded significant results (10 µg) were applied. RESULTS In the groups that had been treated with 1 mg and 10 µg LPS, a significant drop in cochlear microcirculation was observed after 30 (.791 ± .089 Arbitrary Units (AU), compared to baseline, and .888 ± .071AU) and 60 (.756 ± .101 AU and .817 ± .124 AU, respectively) minutes. The groups that had been treated with 100 ng LPS and that had been pretreated with etanercept showed no significant change in cochlear blood flow compared to placebo. CONCLUSION Lipopolysaccharide shows a dose-dependent effect on cochlear microcirculation; this effect can already be observed after 30 min. Pretreatment with etanercept can abrogate this effect, indicating that TNF mediates the effect of LPS on cochlear microcirculation.
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Affiliation(s)
- Friedrich Ihler
- Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig-Maximilians-University of Munich, Munich, Germany.,Walter Brendel Centre of Experimental Medicine, University of Munich Hospital, Munich, Germany
| | - Saskia Freytag
- Population Health and Immunity Division, Walter and Eliza Hall Institute, Parkville, Vic., Australia.,Department of Medical Biology, University of Melbourne, Melbourne, Vic., Australia
| | - Benedikt Kloos
- Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig-Maximilians-University of Munich, Munich, Germany.,Walter Brendel Centre of Experimental Medicine, University of Munich Hospital, Munich, Germany
| | - Jennifer Lee Spiegel
- Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - Frank Haubner
- Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - Martin Canis
- Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig-Maximilians-University of Munich, Munich, Germany.,Walter Brendel Centre of Experimental Medicine, University of Munich Hospital, Munich, Germany
| | - Bernhard G Weiss
- Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig-Maximilians-University of Munich, Munich, Germany.,Walter Brendel Centre of Experimental Medicine, University of Munich Hospital, Munich, Germany
| | - Mattis Bertlich
- Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig-Maximilians-University of Munich, Munich, Germany.,Walter Brendel Centre of Experimental Medicine, University of Munich Hospital, Munich, Germany
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Rodrigues JC, Bachi ALL, Silva GAV, Rossi M, do Amaral JB, Lezirovitz K, de Brito R. New Insights on the Effect of TNF Alpha Blockade by Gene Silencing in Noise-Induced Hearing Loss. Int J Mol Sci 2020; 21:ijms21082692. [PMID: 32294929 PMCID: PMC7215896 DOI: 10.3390/ijms21082692] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/06/2020] [Accepted: 04/10/2020] [Indexed: 02/07/2023] Open
Abstract
Noise exposure represents the second most common cause of acquired sensorineural hearing loss and we observed that tumor necrosis factor α (TNFα) was involved in this context. The effect of Tnfα gene silencing on the expression profile related to the TNFα metabolic pathway in an experimental model of noise-induced hearing loss had not previously been studied. Methods: Single ears of Wistar rats were pretreated with Tnfα small interfering RNA (siRNA) by trans-tympanic administration 24 h before they were exposed to white noise (120 dBSPL for three hours). After 24 h of noise exposure, we analyzed the electrophysiological threshold and the amplitude of waves I, II, III, and IV in the auditory brain response click. In addition, qRT-PCR was performed to evaluate the TNFα metabolic pathway in the ears submitted or not to gene silencing. Results: Preservation of the electrophysiological threshold and the amplitude of waves was observed in the ears submitted to gene silencing compared to the ears not treated. Increased anti-apoptotic gene expression and decreased pro-apoptotic gene expression were found in the treated ears. Conclusion: Our results allow us to suggest that the blockade of TNFα by gene silencing was useful to prevent noise-induced hearing loss.
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Affiliation(s)
- Janaína C. Rodrigues
- Clinical Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil; (K.L.); (R.d.B.)
- Laboratory of Otolaryngology (LIM32), School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil;
- Correspondence:
| | - André L. L. Bachi
- ENT Research Lab. Department of Otorhinolaryngology-Head and Neck Surgery, Federal University of São Paulo. (UNIFESP), São Paulo-SP 04039-032, Brazil; (A.L.L.B.); (M.R.); (J.B.d.A.)
- Brazilian Institute of Teaching and Research in Pulmonary and Exercise Immunology (IBEPIPE), São José dos Campos 12245-520, Brazil
- Post-graduation Program in Health Sciences, Santo Amaro University (UNISA), São Paulo 04829-300, Brazil
| | - Gleiciele A. V. Silva
- Laboratory of Otolaryngology (LIM32), School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil;
| | - Marcelo Rossi
- ENT Research Lab. Department of Otorhinolaryngology-Head and Neck Surgery, Federal University of São Paulo. (UNIFESP), São Paulo-SP 04039-032, Brazil; (A.L.L.B.); (M.R.); (J.B.d.A.)
| | - Jonatas B. do Amaral
- ENT Research Lab. Department of Otorhinolaryngology-Head and Neck Surgery, Federal University of São Paulo. (UNIFESP), São Paulo-SP 04039-032, Brazil; (A.L.L.B.); (M.R.); (J.B.d.A.)
| | - Karina Lezirovitz
- Clinical Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil; (K.L.); (R.d.B.)
- Laboratory of Otolaryngology (LIM32), School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil;
| | - Rubens de Brito
- Clinical Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil; (K.L.); (R.d.B.)
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Kasica N, Podlasz P, Sundvik M, Tamas A, Reglodi D, Kaleczyc J. Protective Effects of Pituitary Adenylate Cyclase-Activating Polypeptide (PACAP) Against Oxidative Stress in Zebrafish Hair Cells. Neurotox Res 2016; 30:633-647. [PMID: 27557978 PMCID: PMC5047952 DOI: 10.1007/s12640-016-9659-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 07/26/2016] [Accepted: 08/09/2016] [Indexed: 12/30/2022]
Abstract
Pituitary adenylate cyclase-activating polypeptide (PACAP) is a pleiotropic neuropeptide, with known antiapoptotic functions. Our previous in vitro study has demonstrated the ameliorative role of PACAP-38 in chicken hair cells under oxidative stress conditions, but its effects on living hair cells is now yet known. Therefore, the aim of the present study was to investigate in vivo the protective role of PACAP-38 in hair cells found in zebrafish (Danio rerio) sense organs-neuromasts. To induce oxidative stress the 5-day postfertilization (dpf) zebrafish larvae were exposed to 1.5 mM H2O2 for 15 min or 1 h. This resulted in an increase in caspase-3 and p-38 MAPK level in the hair cells as well as in an impairment of the larvae basic behavior. To investigate the ameliorative role of PACAP-38, the larvae were incubated with a mixture of 1.5 mM H2O2 and 100 nM PACAP-38 following 1 h preincubation with 100 nM PACAP-38 only. PACAP-38 abilities to prevent hair cells from apoptosis were investigated. Whole-mount immunohistochemistry and confocal microscopy analyses revealed that PACAP-38 treatment decreased the cleaved caspase-3 level in the hair cells, but had no influence on p-38 MAPK. The analyses of basic locomotor activity supported the protective role of PACAP-38 by demonstrating the improvement of the fish behavior after PACAP-38 treatment. In summary, our in vivo findings demonstrate that PACAP-38 protects zebrafish hair cells from oxidative stress by attenuating oxidative stress-induced apoptosis.
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Affiliation(s)
- Natalia Kasica
- Department of Animal Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13, box 105J, 10-719, Olsztyn, Poland.
| | - Piotr Podlasz
- Department of Pathophysiology, Forensic Veterinary and Administration, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13, 10-719, Olsztyn, Poland
| | - Maria Sundvik
- Department of Anatomy, Neuroscience Center, University of Helsinki, Haartmaninkatu 8 (Biomedicum Helsinki), 00290, Helsinki, Finland
| | - Andrea Tamas
- Department of Anatomy, University of Pecs, Szigeti 12, 7624, Pecs, Hungary
| | - Dora Reglodi
- Department of Anatomy, University of Pecs, Szigeti 12, 7624, Pecs, Hungary
| | - Jerzy Kaleczyc
- Department of Animal Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13, box 105J, 10-719, Olsztyn, Poland
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Kao S, Soares VY, Kristiansen AG, Stankovic KM. Activation of TRAIL-DR5 pathway promotes sensorineural degeneration in the inner ear. Aging Cell 2016; 15:301-8. [PMID: 26791792 PMCID: PMC4783338 DOI: 10.1111/acel.12437] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/14/2015] [Indexed: 01/23/2023] Open
Abstract
Tumor necrosis factor (TNF) family cytokines are important mediators of inflammation. Elevated levels of serum TNF‐α are associated with human sensorineural hearing loss via poorly understood mechanisms. We demonstrate, for the first time, expression of TNF‐related apoptosis‐inducing ligand (TRAIL) and its signaling death receptor 5 (DR5) in the murine inner ear and show that exogenous TRAIL can trigger hair cell and neuronal degeneration, which can be partly prevented with DR5‐blocking antibodies.
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Affiliation(s)
- Shyan‐Yuan Kao
- Eaton Peabody Laboratories and Department of Otolaryngology Massachusetts Eye and Ear Infirmary Boston MA USA
| | - Vitor Y.R. Soares
- Eaton Peabody Laboratories and Department of Otolaryngology Massachusetts Eye and Ear Infirmary Boston MA USA
- Department of Otology and Laryngology Harvard Medical School Boston MA USA
| | - Arthur G. Kristiansen
- Eaton Peabody Laboratories and Department of Otolaryngology Massachusetts Eye and Ear Infirmary Boston MA USA
| | - Konstantina M. Stankovic
- Eaton Peabody Laboratories and Department of Otolaryngology Massachusetts Eye and Ear Infirmary Boston MA USA
- Department of Otology and Laryngology Harvard Medical School Boston MA USA
- Program in Speech and Hearing Bioscience and Technology Harvard Medical School Boston MA USA
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Gao B, Chang C, Zhou J, Zhao T, Wang C, Li C, Gao G. Pycnogenol Protects Against Rotenone-Induced Neurotoxicity in PC12 Cells Through Regulating NF-κB-iNOS Signaling Pathway. DNA Cell Biol 2015. [PMID: 26203556 DOI: 10.1089/dna.2015.2953] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Parkinson's disease (PD) is a common neurodegenerative disorder characterized by dopaminergic neurons degeneration and oxidative damage may underlie this process. However, there are still no efficient drugs to cure the disease. Pycnogenol (PYC) isolated from the procyanidin-rich French maritime pine (Pinus maritime) bark has shown various antioxidant activities in previous studies. In this study, we explored its effect against rotenone (Rot)-induced neurotoxicity and the underlying mechanisms in PC12 cells. Using Rot-induced cell model of PD, we found that PYC treatment significantly increased cell viability and decreased cell apoptosis in Rot-treated PC12 cells in a dose-dependent manner. Furthermore, data showed that PYC markedly reduced inducible nitric oxide synthase (iNOS)-nitric oxide (NO) signaling in Rot-treated PC12 cells. Pretreatment with the iNOS-specific inhibitor significantly attenuated Rot-induced neurotoxicity. Moreover, PYC was found to be capable of reducing Rot-induced NF-κB activation. Blocking NF-κB signaling with its inhibitor mimicked the biological effect of PYC on Rot-induced iNOS and NO expression levels, as well as neurotoxicity in PC12 cells, suggesting that the NF-κB-iNOS signaling pathway was likely to participate in the PYC-mediated protective progress. Our results suggest that PYC protects against Rot-induced neurotoxicity in PC12 cells, and the mechanism may be associated with the downregulation of NF-κB-iNOS signaling pathway.
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Affiliation(s)
- Bo Gao
- 1 Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University , Xi'an, People's Republic of China
| | - Chongwang Chang
- 1 Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University , Xi'an, People's Republic of China
| | - Jie Zhou
- 2 Department of Neurosurgery, Lanzhou Military Region General Hospital , Lanzhou, People's Republic of China
| | - Tianzhi Zhao
- 1 Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University , Xi'an, People's Republic of China
| | - Chao Wang
- 1 Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University , Xi'an, People's Republic of China
| | - Chen Li
- 1 Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University , Xi'an, People's Republic of China
| | - Guodong Gao
- 1 Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University , Xi'an, People's Republic of China
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Tumor Necrosis Factor-α-Induced Ototoxicity in Mouse Cochlear Organotypic Culture. PLoS One 2015; 10:e0127703. [PMID: 26000970 PMCID: PMC4441368 DOI: 10.1371/journal.pone.0127703] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 04/17/2015] [Indexed: 12/20/2022] Open
Abstract
Tumor necrosis factor (TNF)-α is a cytokine involved in acute inflammatory phase reactions, and is the primary upstream mediator in the cochlear inflammatory response. Treatment of the organ of Corti with TNF-α can induce hair cell damage. However, the resulting morphological changes have not been systematically examined. In the present study, cochlear organotypic cultures from neonatal mice were treated with various concentrations and durations of TNF-α to induce inflammatory responses. Confocal microscopy was used to evaluate the condition of hair cells and supporting cells following immunohistochemical staining. In addition, the ultrastructure of the stereocilia bundle, hair cells, and supporting cells were examined by scanning and transmission electron microscopy. TNF-α treatment resulted in a fusion and loss of stereocilia bundles in hair cells, swelling of mitochondria, and vacuolation and degranulation of the endoplasmic reticulum. Disruption of tight junctions between hair cells and supporting cells was also observed at high concentrations. Hair cell loss was preceded by apoptosis of Deiters' and pillar cells. Taken together, these findings detail the morphological changes in the organ of Corti after TNF-α treatment, and provide an in vitro model of inflammatory-induced ototoxicity.
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11
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Dinh CT, Goncalves S, Bas E, Van De Water TR, Zine A. Molecular regulation of auditory hair cell death and approaches to protect sensory receptor cells and/or stimulate repair following acoustic trauma. Front Cell Neurosci 2015; 9:96. [PMID: 25873860 PMCID: PMC4379916 DOI: 10.3389/fncel.2015.00096] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Accepted: 03/03/2015] [Indexed: 12/20/2022] Open
Abstract
Loss of auditory sensory hair cells (HCs) is the most common cause of hearing loss. This review addresses the signaling pathways that are involved in the programmed and necrotic cell death of auditory HCs that occur in response to ototoxic and traumatic stressor events. The roles of inflammatory processes, oxidative stress, mitochondrial damage, cell death receptors, members of the mitogen-activated protein kinase (MAPK) signal pathway and pro- and anti-cell death members of the Bcl-2 family are explored. The molecular interaction of these signal pathways that initiates the loss of auditory HCs following acoustic trauma is covered and possible therapeutic interventions that may protect these sensory HCs from loss via apoptotic or non-apoptotic cell death are explored.
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Affiliation(s)
- Christine T Dinh
- University of Miami Ear Institute, University of Miami Miller School of Medicine Miami, FL, USA
| | - Stefania Goncalves
- University of Miami Ear Institute, University of Miami Miller School of Medicine Miami, FL, USA
| | - Esperanza Bas
- University of Miami Ear Institute, University of Miami Miller School of Medicine Miami, FL, USA
| | - Thomas R Van De Water
- University of Miami Ear Institute, University of Miami Miller School of Medicine Miami, FL, USA
| | - Azel Zine
- Integrative and Adaptive Neurosciences, Aix-Marseille Université, CNRS, UMR 7260 Marseille, France ; Faculty of Pharmacy, Biophysics Department, University of Montpellier Montpellier, France
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Inhibition of p38 mitogen-activated protein kinase ameliorates radiation-induced ototoxicity in zebrafish and cochlea-derived cell lines. Neurotoxicology 2013; 40:111-22. [PMID: 24374476 DOI: 10.1016/j.neuro.2013.12.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 12/04/2013] [Accepted: 12/10/2013] [Indexed: 11/21/2022]
Abstract
Radiation is a widely used treatment for head and neck cancers, and one of its most severe side effects is ototoxicity. Radiation-induced ototoxicity has been demonstrated to be linked to the increased production of ROS and MAPK. We intended to investigate the effect of p38 inhibition on radiation-induced ototoxicity in cochlea-derived HEI-OC1 cells and in a zebrafish model. The otoprotective effect of p38 inhibition against radiation was tested in vitro in the organ of Corti-derived cell line, HEI-OC1, and in vivo in a zebrafish model. Radiation-induced apoptosis, mitochondrial dysfunction, and an increase of intracellular NO generation were demonstrated in HEI-OC1 cells. The p38-specific inhibitor, SB203580, ameliorated radiation-induced apoptosis and mitochondrial injury in HEI-OC1 cells. p38 inhibition reduced radiation-induced activation of JNK, p38, cytochrome c, and cleavage of caspase-3 and PARP in HEI-OC1 cells. Scanning electron micrography showed that SB203580 prevented radiation-induced destruction of kinocilium and stereocilia in zebrafish neuromasts. The results of this study suggest that p38 plays an important role in mediating radiation-induced ototoxicity and inhibition of p38 could be a plausible option for preventing radiation ototoxicity.
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Key Words
- Apoptosis
- DMEM,
- DMSO,
- Dulbecco's modified Eagle's medium
- ERK,
- FBS,
- FITC,
- HNSCC,
- IHC,
- Inner hair cell
- JNK,
- MAPK,
- MMP,
- NO,
- PARP,
- PBS,
- PI,
- ROS,
- SB203580
- SEM,
- SNHL,
- TUNEL,
- c-Jun N-terminal kinase
- days post-fertilization
- dimethyl sulfoxide
- dpf,
- extracellular signal-regulated kinases
- fetal bovine serum
- fluorescein isothiocyanate
- head and neck squamous cell carcinoma
- hearing preservation
- mitochondrial membrane potential
- mitogen-activated protein kinase
- nitric oxide
- p38
- p38, p38
- phosphate buffered saline
- poly ADP ribose polymerase
- propidium iodide
- radiation
- reactive oxygen species
- scanning electron microscopy
- sensorineural hearing loss
- terminal deoxynucleotidyl transferase (TdT)-mediated dUTP-biotin nick end labeling
- zebrafish
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13
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Oishi N, Chen J, Zheng HW, Hill K, Schacht J, Sha SH. Tumor necrosis factor-alpha-mutant mice exhibit high frequency hearing loss. J Assoc Res Otolaryngol 2013; 14:801-11. [PMID: 23996384 DOI: 10.1007/s10162-013-0410-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Accepted: 07/29/2013] [Indexed: 12/20/2022] Open
Abstract
Exogenous tumor necrosis factor-alpha (TNF-α) plays a role in auditory hair cell death by altering the expression of apoptosis-related genes in response to noxious stimuli. Little is known, however, about the function of TNF-α in normal hair cell physiology. We, therefore, investigated the cochlear morphology and auditory function of TNF-α-deficient mice. Auditory evoked brainstem response showed significantly higher thresholds, especially at higher frequencies, in 1-month-old TNF-α(-/-) mice as compared to TNF-α(+/-) and wild type (WT); hearing loss did not progress further from 1 to 4 months of age. There was no difference in the gross morphology of the organ of Corti, lateral wall, and spiral ganglion cells in TNF-α(-/-) mice compared to WT mice at 4 months of age, nor were there differences in the anatomy of the auditory ossicles. Outer hair cells were completely intact in surface preparations of the organ of Corti of TNF-α(-/-) mice, and synaptic ribbon counts of TNF-α(-/-) and WT mice at 4 months of age were similar. Reduced amplitudes of distortion product otoacoustic emissions, however, indicated dysfunction of outer hair cells in TNF-α(-/-) mice. Scanning electron microscopy revealed that stereocilia were sporadically absent in the basal turn and distorted in the middle turn. In summary, our results demonstrate that TNF-α-mutant mice exhibit early hearing loss, especially at higher frequencies, and that loss or malformation of the stereocilia of outer hair cells appears to be a contributing factor.
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Affiliation(s)
- Naoki Oishi
- Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan, Ann Arbor, MI, 48109-5616, USA
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14
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Yang S, Chen Y, Deng X, Jiang W, Li B, Fu Z, Du M, Ding R. Hemoglobin-induced nitric oxide synthase overexpression and nitric oxide production contribute to blood-brain barrier disruption in the rat. J Mol Neurosci 2013; 51:352-63. [PMID: 23494638 DOI: 10.1007/s12031-013-9990-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Accepted: 03/03/2013] [Indexed: 12/22/2022]
Abstract
Hemoglobin (Hb) released from extravasated erythrocytes may have a critical role in the process of blood-brain barrier (BBB) disruption and subsequent edema formation after intracerebral hemorrhage (ICH). Excessive nitric oxide (NO) production synthesized by nitric oxide synthase (NOS) has been well documented to contribute to BBB disruption. However, considerably less attention has been focused on the role of NO in Hb-induced BBB disruption. This study was designed to examine the hypothesis that Hb-induced NOS overexpression and excessive NO production may contribute to the changes of tight junction (TJ) proteins and subsequent BBB dysfunction. Hemoglobin was infused with stereotactic guidance into the right caudate nucleus of male Sprague Dawley rats. Then, we investigated the effect of Hb on the BBB permeability, changes of TJ proteins (claudin-5, occludin, zonula occludens-1 (ZO-1), and junctional adhesion molecule-1 (JAM-1)), iron deposition, expression of inducible NOS (iNOS) and endothelial NOS (eNOS), as well as NO production. Hb injection caused a significant increase in BBB permeability. Significant reduction of claudin-5, ZO-1, and JAM-1 was observed after Hb injection as evidenced by PCR and immunofluorescence. After a decrease at early stage, occludin showed a fivefold increase in mRNA level at 7 days. Significant iron deposition was detectable from 48 h to 7 days in a time-dependent manner. The iNOS and eNOS levels dramatically increased after Hb injection concomitantly with large quantities of NO released. Furthermore, enhanced iNOS or eNOS immunoreactivity was co-localized with diffused or diminished claudin-5 staining. We concluded that overexpressed NOS and excessive NO production induced by Hb may contribute to BBB disruption, which may provide an important potential therapeutic target in the treatment of ICH.
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Affiliation(s)
- Shuo Yang
- The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, China
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15
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Shin YS, Song SJ, Kang SU, Hwang HS, Choi JW, Lee BH, Jung YS, Kim CH. A novel synthetic compound, 3-amino-3-(4-fluoro-phenyl)-1H-quinoline-2,4-dione, inhibits cisplatin-induced hearing loss by the suppression of reactive oxygen species: in vitro and in vivo study. Neuroscience 2012; 232:1-12. [PMID: 23246618 DOI: 10.1016/j.neuroscience.2012.12.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 12/05/2012] [Accepted: 12/06/2012] [Indexed: 12/20/2022]
Abstract
Cisplatin, a chemotherapeutic agent for treating various solid tumors, produces hearing loss in approximately half a million cancer patients annually in the United States. In the course of developing a new protective agent against cisplatin-induced ototoxicity, we have been interested in a novel synthetic compound, 3-amino-3-(4-fluoro-phenyl)-1H-quinoline-2,4-dione (KR-22332). The effect of KR-22332 on cisplatin-induced cytotoxicity was analyzed in vitro in an organ of Corti-derived cell line (HEI-OC1), and in vivo in a zebrafish and rat model. Cisplatin-induced apoptosis, reactive oxygen species (ROS) generation and altered mitochondrial membrane potential (MMP) in HEI-OC1 cells were observed. KR-22332 significantly inhibited cisplatin-induced apoptosis, change of MMP, and intracellular ROS generation. KR-22332 markedly attenuated the cisplatin-induced loss and changes of auditory neuromasts in the zebrafish. Transtympanic administration of KR-22332 in a rat model was protective against cisplatin-induced hearing loss, as determined by click-evoked auditory brainstem response (p<0.01). Tissue terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling of rat cochlea demonstrated that KR-22332 blocked cisplatin-induced apoptosis. In addition, transtympanic administration of KR-22332 inhibited cisplatin-induced nicotinamide adenine dinucleotide phosphate-oxidase 3 (NOX3) overexpression in the rat cochlea. KR-22332 significantly reduced the expression of p-53, mitogen-activated protein kinases, caspase 3, and tumor necrosis factor-α compared to their significant increase after cisplatin treatment. The results of this study suggest that KR-22332 may prevent ototoxicity caused by the administration of cisplatin through the inhibition of mitochondrial dysfunction and the suppression of ROS generation. These novel findings implicate KR-22332 as a potential candidate for protective agent against cisplatin-induced ototoxicity.
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Affiliation(s)
- Y S Shin
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, Republic of Korea; Center for Cell Death Regulating Biodrug, School of Medicine, Ajou University, Suwon, Republic of Korea
| | - S J Song
- Bio-organic Science Division, Korea Research Institute of Chemical Technology, Yuseong, Daejeon, Republic of Korea
| | - S U Kang
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, Republic of Korea; Center for Cell Death Regulating Biodrug, School of Medicine, Ajou University, Suwon, Republic of Korea
| | - H S Hwang
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, Republic of Korea; Center for Cell Death Regulating Biodrug, School of Medicine, Ajou University, Suwon, Republic of Korea
| | - J W Choi
- Department of Molecular Science & Technology, School of Medicine, Ajou University, Suwon, Republic of Korea
| | - B H Lee
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, Republic of Korea; Center for Cell Death Regulating Biodrug, School of Medicine, Ajou University, Suwon, Republic of Korea
| | - Y-S Jung
- Bio-organic Science Division, Korea Research Institute of Chemical Technology, Yuseong, Daejeon, Republic of Korea
| | - C-H Kim
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, Republic of Korea; Center for Cell Death Regulating Biodrug, School of Medicine, Ajou University, Suwon, Republic of Korea.
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